Data encryption method and device applied to electric energy meter and storage medium

Abstract

The invention discloses a data encryption method and device applied to an electric energy meter and a storage medium. The method comprises the steps: obtaining a public key ciphertext, and decryptingthe public key ciphertext through an authentication public key, so as to obtain a public key of a management module; and the random number generated by the random number generator is encrypted throughthe public key to obtain a random number ciphertext, and the random number ciphertext is sent to the management module, so that the management module can decrypt the random number ciphertext througha private key of the management module to obtain the random number to realize synchronization of the encryption key. And finally, encrypting or decrypting the communication data by taking the random number as an encryption key. Therefore, the data volume of the public key and the random number of the management module is small, asymmetric encryption is carried out on the public key and the randomnumber, the problem of large calculation amount can be solved, and the safety is high; the communication data is encrypted symmetrically due to the fact that the data volume of the communication datais large, and the used encryption key is a random number, so that a key management big database is not needed, and the problem that an electric power company needs to additionally add the key management big database can be solved.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a data encryption method, device and storage medium applied to electric energy meters. Background technique [0002] The electric energy meter in this application mainly refers to the multi-core multi-module intelligent electric energy meter, which may include but not limited to IR46 electric energy meter, wherein the electric energy meter is composed of metering module, management module, communication module and expansion module, etc. Composed to realize the electric energy meter with the functions of electric energy metering, data processing, real-time monitoring, automatic control and information interaction. [0003] The IR46 standard divides the software part into legal metering part software and non-legal metering part software, and clearly states that the electric energy meter should be able to protect legal metering information and isolate the metering ...

AI Technical Summary

Problems solved by technology

[0010] Disadvantages of Scheme 1: Due to the dual-core physical separation scheme, and the communication protocol between the dual-core links is open, if a third-party illegal intermediary uses illegal means to intercept the communication data and re-use the dual-core link communication protocol after modification After the format is combined and sent to the receiving end, the receiving end cannot know whether the source of the data is legal. Once the data is processed as legal data, it is very likely to cause abnormal data and operation of the electric energy meter, affecting legal measurement, and invalidating measurement data errors.

[0011] Disadvantages of Scheme 2: The power company needs to manage the encryption key of the electric energy meter in a large database. When the management module is damaged on site and needs to be replaced, the electric power company needs to obtain the encryption key between the two cores of the electric energy meter by obtaining the asset information of the electric energy meter. key and set it to the new management module, after which the new management module can be used to replace the fault management module

Since the management of the key database is relatively complicated and once the management module needs to be replaced on site, the operation and maintenance workload is huge and the operation is inconvenient

[0012] Disadvantages of scheme 3: firstly, asymmetric encryption and decryption are very time-consuming, and it is not suitable to transmit data with a large amount of data, which affects the efficiency of communication transmission between two cores; in addition, asymmetric encryption and decryption also requires the power company to manage a large database of electric energy meter keys. When the management module is damaged on site and needs to be replaced, the power company needs to obtain the key of the energy meter management module by obtaining the asset information of the energy meter and set it to the new management module. After that, the new management module can be used to replace the fault management module. Group

Since the management of the key database is relatively complicated and once the management module needs to be replaced on site, the operation and maintenance workload is huge and the operation is inconvenient

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